Insulating coating composition and an insulated wire, and a coil formed using the same

Abstract

An insulating coating composition that improves lubricity without reduction of the varnish adhesion strength and an insulated wire using the insulating coating composition, and a coil using the insulated wire are provided. An insulating coating composition comprises a polyamide-imide resin, which is obtained through a synthetic reaction of isocyanate component with acid component, and a lubricant component, wherein the terminal isocyanate group of the polyamide-imide resin is capped with a blocking agent of higher alcohol having a carbon number of eight or more.

1. An insulating coating composition comprised of a polyamide-imide resin, which is obtained by a synthetic reaction of isocyanate component with acid component, and a lubricant component,
 wherein the polyamide-imide resin has its terminal group comprising an isocyanate group which is capped with a blocking agent, and 
 wherein the blocking agent comprises a higher alcohol having a carbon number of eight or more. 
 
     
     
       2. The insulating coating composition according to  claim 1 , wherein the blocking agent ceases a synthetic reaction of the isocyanate component with the acid component. 
     
     
       3. The insulating coating composition according to  claim 1 ,
 wherein the higher alcohol is selected from the group consisting of stearyl alcohol, oleyl alcohol, dodecanol and octanol, and 
 wherein the blocking agent comprises a higher alcohol having a carbon number between 15 and 30. 
 
     
     
       4. An insulating coating composition comprised of a polyamide-imide resin, which is obtained by a synthetic reaction of isocyanate component with acid component, and a lubricant component, wherein a terminal isocyanate group of said polyamide-imide resin is capped with a blocking agent of a higher alcohol haying a carbon number of eight or more,
 wherein said blocking agent is added in a molar amount within the range from not less than 0.3 mol % to less than 5 mol % of the molar amount of said isocyanate component.